# RequestTrackedChangeCallback Function

> Callback function for requests expecting a TrackedChange value.

- **Product:** DS Server
- **Section:** Reference
- **Kind:** Function
- **Path:** DS Server > Reference > JavaScript API > RequestTrackedChangeCallback Function
- **293 words**
- **Web URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requesttrackedchangecallback/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requesttrackedchangecallback/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/reference/javascript/requesttrackedchangecallback/llms-full.txt

---

### Description

Callback function for requests expecting a [TrackedChange](https://docs.textcontrol.com/ds-server/reference/javascript/trackedchange/llms-full.txt) value.

### Syntax

```javascript
function(<TrackedChange> change)
```

### Examples

The following example demonstrates `RequestTrackedChangeCallback` in a practical document-editing workflow. Callback function for requests expecting a TrackedChange value.

```javascript
function onTxError(error) {
    console.error("TX Text Control error:", error.msg);
    error.handled = true;
}

function requestTrackedChangeCallback(change) {
    console.log("change:", change);
}

TXTextControl.textParts.getMainText(function(mainText) {
    const trackedChanges = mainText.trackedChanges;
    trackedChanges.getItem(requestTrackedChangeCallback, true, onTxError);
}, onTxError);
```

---

## Nearby

- **Previous:** [RequestTextTypeCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requesttexttypecallback/llms-full.txt)
- **Next:** [RequestVerticalAlignmentCallback Function](https://docs.textcontrol.com/ds-server/reference/javascript/requestverticalalignmentcallback/llms-full.txt)